Note 4 - Loans and Allowance for Loan Losses - Aging Analysis of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Loans, past due	$ 3,806	$ 5,911
Loans, current	1,031,457	965,064
Loans, net of unearned income	1,035,263	970,975
Loans Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual	3,887	6,423
Financing Receivables 30 to 89 Days Past Due [Member]
Loans, past due	2,233	2,395
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, past due	1,573	3,516
Real Estate Portfolio Segment [Member]
Loans, net of unearned income	916,806	870,892
Real Estate Portfolio Segment [Member] \| Real Estate Construction and Land Development [Member]
Loans, past due	102	620
Loans, current	129,079	119,610
Loans, net of unearned income	129,181	120,230
Loans Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual	151	712
Real Estate Portfolio Segment [Member] \| Real Estate Construction and Land Development [Member] \| Financing Receivables 30 to 89 Days Past Due [Member]
Loans, past due	15	393
Real Estate Portfolio Segment [Member] \| Real Estate Construction and Land Development [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, past due	87	227
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Residential [Member]
Loans, past due	1,698	2,733
Loans, current	353,606	347,562
Loans, net of unearned income	355,304	350,295
Loans Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual	1,763	2,316
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Residential [Member] \| Financing Receivables 30 to 89 Days Past Due [Member]
Loans, past due	1,160	1,935
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Residential [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, past due	538	798
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Farmland and Other Commercial Enterprises [Member]
Loans, past due	1,914	2,483
Loans, current	430,407	397,884
Loans, net of unearned income	432,321	400,367
Loans Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual	1,752	3,383
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Farmland and Other Commercial Enterprises [Member] \| Financing Receivables 30 to 89 Days Past Due [Member]
Loans, past due	966	0
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Farmland and Other Commercial Enterprises [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, past due	948	2,483
Commercial Portfolio Segment [Member]
Loans, net of unearned income	110,542	90,848
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Loans, past due	62	0
Loans, current	63,355	48,607
Loans, net of unearned income	63,417	48,607
Loans Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual	53	0
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member] \| Financing Receivables 30 to 89 Days Past Due [Member]
Loans, past due	62	0
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, past due	0	0
Commercial Portfolio Segment [Member] \| States and Political Subdivisions [Member]
Loans, past due	0	0
Loans, current	27,209	18,933
Loans, net of unearned income	27,209	18,933
Loans Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual	0	0
Commercial Portfolio Segment [Member] \| States and Political Subdivisions [Member] \| Financing Receivables 30 to 89 Days Past Due [Member]
Loans, past due	0	0
Commercial Portfolio Segment [Member] \| States and Political Subdivisions [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, past due	0	0
Commercial Portfolio Segment [Member] \| Commercial Other [Member]
Loans, past due	21	24
Loans, current	19,895	23,284
Loans, net of unearned income	19,916	23,308
Loans Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual	0	0
Commercial Portfolio Segment [Member] \| Commercial Other [Member] \| Financing Receivables 30 to 89 Days Past Due [Member]
Loans, past due	21	24
Commercial Portfolio Segment [Member] \| Commercial Other [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, past due	0	0
Consumer Portfolio Segment [Member]
Loans, net of unearned income	7,915	9,235
Consumer Portfolio Segment [Member] \| Consumer Secured [Member]
Loans, past due	0	13
Loans, current	4,853	4,541
Loans, net of unearned income	4,853	4,554
Loans Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual	0	4
Consumer Portfolio Segment [Member] \| Consumer Secured [Member] \| Financing Receivables 30 to 89 Days Past Due [Member]
Loans, past due	0	13
Consumer Portfolio Segment [Member] \| Consumer Secured [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, past due	0	0
Consumer Portfolio Segment [Member] \| Consumer Unsecured [Member]
Loans, past due	9	38
Loans, current	3,053	4,643
Loans, net of unearned income	3,062	4,681
Loans Past Due 90 Days or More and Still Accruing	0	0
Nonaccrual	168	8
Consumer Portfolio Segment [Member] \| Consumer Unsecured [Member] \| Financing Receivables 30 to 89 Days Past Due [Member]
Loans, past due	9	30
Consumer Portfolio Segment [Member] \| Consumer Unsecured [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, past due	$ 0	$ 8

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

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Financing receivables that are current.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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